C#画图板的详细示例代码

当然可以。下面是一个更详细的C#画图板示例代码,它使用WindowsForms,并实现了基本的绘图功能,包括线条、矩形和椭圆的绘制。此外,该示例还使用了双缓冲技术来减少闪烁,并将绘制的图形保存在一个列表中,以便在窗体重新绘制时能够恢复它们。

首先,创建一个新的WindowsForms应用程序项目,并在Form1的设计视图中添加一个Panel控件作为绘图区域。然后,按照以下步骤添加代码:

  1. 打开你的项目,并在Form1.cs中添加以下代码:

【csharp】

using System;

using System.Collections.Generic;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace DrawingBoardApp

{

public partial class Form1 : Form

{

private List<Shape> shapes = new List<Shape>();

private bool isDrawing = false;

private Shape currentShape = null;

private Point lastPoint = Point.Empty;

public Form1()

{

InitializeComponent();

this.panel1.Paint += new PaintEventHandler(Panel1_Paint);

this.panel1.MouseDown += new MouseEventHandler(Panel1_MouseDown);

this.panel1.MouseMove += new MouseEventHandler(Panel1_MouseMove);

this.panel1.MouseUp += new MouseEventHandler(Panel1_MouseUp);

this.panel1.DoubleClick += new EventHandler(Panel1_DoubleClick);

this.panel1.SetStyle(ControlStyles.OptimizedDoubleBuffer |

ControlStyles.AllPaintingInWmPaint |

ControlStyles.UserPaint, true);

this.panel1.UpdateStyles();

}

private void Panel1_Paint(object sender, PaintEventArgs e)

{

foreach (var shape in shapes)

{

shape.Draw(e.Graphics);

}

}

private void Panel1_MouseDown(object sender, MouseEventArgs e)

{

isDrawing = true;

currentShape = new LineShape(lastPoint, e.Location);

lastPoint = e.Location;

}

private void Panel1_MouseMove(object sender, MouseEventArgs e)

{

if (isDrawing)

{

if (currentShape is LineShape)

{

currentShape = new LineShape(lastPoint, e.Location);

}

else if (currentShape is RectangleShape)

{

Rectangle rect = ((RectangleShape)currentShape).Rectangle;

rect.Width = e.X - rect.X;

rect.Height = e.Y - rect.Y;

currentShape = new RectangleShape(rect);

}

else if (currentShape is EllipseShape)

{

Rectangle rect = ((EllipseShape)currentShape).Rectangle;

int width = Math.Abs(e.X - rect.X);

int height = Math.Abs(e.Y - rect.Y);

Point center = new Point((rect.X + e.X) / 2, (rect.Y + e.Y) / 2);

rect = new Rectangle(center.X - width / 2, center.Y - height / 2, width, height);

currentShape = new EllipseShape(rect);

}

// Redraw the panel to show the current shape being drawn

panel1.Invalidate();

}

}

private void Panel1_MouseUp(object sender, MouseEventArgs e)

{

isDrawing = false;

if (currentShape != null)

{

shapes.Add(currentShape);

currentShape = null;

}

}

private void Panel1_DoubleClick(object sender, EventArgs e)

{

// Clear the shapes list to erase the drawing board

shapes.Clear();

panel1.Invalidate();

}

// Abstract base class for shapes

private abstract class Shape

{

public abstract void Draw(Graphics g);

}

// Line shape class

private class LineShape : Shape

{

public Point StartPoint { get; private set; }

public Point EndPoint { get; private set; }

public LineShape(Point startPoint, Point endPoint)

{

StartPoint = startPoint;

EndPoint = endPoint;

}

public override void Draw(Graphics g)

{

g.DrawLine(Pens.Black, StartPoint, EndPoint);

}

}

// Rectangle shape class

private class RectangleShape : Shape

{

public Rectangle Rectangle { get; private set; }

public RectangleShape(Rectangle rectangle)

{

Rectangle = rectangle;

}

public override void Draw(Graphics g)

{

g.DrawRectangle(Pens.Black, Rectangle);

}

}

// Ellipse shape class

private class EllipseShape : Shape

{

public Rectangle Rectangle { get; private set; }

public EllipseShape(Rectangle rectangle)

{

Rectangle = rectangle;

}

public override void Draw(Graphics g)

{

g.DrawEllipse(Pens.Black, Rectangle);

}

}

}

}

  1. 在Form1.Designer.cs中,确保你的Form1设计视图中有一个名为panel1的Panel控件,并调整其属性(如Dock设置为Fill)以匹配上述说明。此外,确保InitializeComponent方法中包含了对panel1的初始化代码。

  2. 运行你的项目。现在,你应该能够在Panel上绘制线条、矩形和椭圆。双击Panel可以清除绘图板上的所有图形。

请注意,这个示例代码提供了基本的绘图功能,但你可以根据需要进行扩展和改进,例如添加更多的形状、颜色选择、线条粗细调整等功能。

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